In Walkingstick 

[What is the significance of April 30th to Iraq.]

They have a set date for their rate changes. Every April of every year, the IMF updates the exchange rate of Iraq. Iraq does not have to wait till the 30th. They can do it today or tomorrow but when the IMF updates it will reflect the new rate for Iraq.

It often does not show up for seven days. Come up on the 7th of May all the nations that changed in the month of April. They do not have an option. Again, this is not an option.  They have to do this.